Removable secondary glazing for windows



Feb. 12, 1957 c. e. LYON REMOVABLE SECONDARY GLAZING FOR wmnows Filed July 2, 1954 INVENTOR.

Charles G; Lyon REMOVABLE SECONDARY GLAZING FOR WINDOWS Charles G. Lyon, Winnipeg, Manitoba, Canada Application July 2, 1954, Serial No. 440,959

4 Claims. (Cl. 2056.4)

The invention relates to the glazing of windows and the principal object thereof is to provide means for a secondary independent glazing to a single glazed window to reduce frosting in winter, provide greater insulation thereto and can be easily removed for thorough cleansing of the sides of both glasses, besides the advantage of single pane replacement if broken.

A further object of the invention is to design said means in a very simple manner for quick attachment to and without altering said window, and such that the extra glass may be installed or removed in a minimum of time and without the use of special tools.

A still further object of the invention is to arrange said means so that standard panes of glass can be used for the extra glazing and so further reduce costs.

With the above important objects in view the invention consists essentially in the construction and arrangement of parts hereinafter more particularly described, reference being had to the accompanying drawings in which:

Figure 1 is a perspective view of a slidable sash for a window.

Figure 2 is an enlarged vertical section centrally through the sash.

Figure 3 is an enlarged cross section through the sash horizontally.

Figure 4 is a perspective view of one end of a thin steel stripping used for holding the secondary glass in place.

Figure 5 is a view similar to Figure 4 but showing a modified construction.

Figure 6 is a further modification for a metal window.

In the drawings like characters of reference indicate corresponding parts in the several figures.

The lower sash 10 of a double hung window is shown in Figure l and is of the usual rectangular-shape having side stiles 11 and 12 connected by a top rail 13 and bottom rail 14. On standard windows the inner inside corners of the rails and stiles are usually finished in a stepforrnation, such as by the ogee shown at 15. The opposite outer corners of the stiles and lower rail are rabbeted out, as at 16, while the upper rail 13 projects outwardly with a slight sloping face 17 to wedge against a similar sloping lower rail on the upper sash (not shown) when both are closed. The under side of the top rail 13 is grooved, as at 18, with one edge of the groove aligned with the inner edges of the rabbets 16 so a pane of glass 19 can slide thereup and be received against said rabbeted edges. The outer parts of the rabbets are then puttied, as at 20, to hold the pane in place. This is all well known construction.

The invention consists in the use of a series of thin metal strips 21, shown in Fig. 4. These strips are pressed in a cross sectional curve for their full length, as shown at 22. A pair of these strips are positioned vertically, one on each of the stiles, from the top meeting outer sides, such as by spaced nails 24. In positioning these strips, the central curved portions project outwardly from the stiles so that their edges are in contact therewith and the inner edges of each can be sprung outwardly against the resiliency in the strips.

A further horizontal metal strip 21 is secured to the bottom rail 14, as shown at 25. This strip is secured in the same manner as the strips 23. Before being secured, a resilient strip of rubber or tape 26 is interposed or cemented between the upper edge of the strip 25 and the lower rail 14 and this resilient strip projects slightly above the strip 25, as indicated at 27.

A spacing strip 28, preferably of wood, is secured to the under side of the top rail 13, such as by nails 29. The width of this spacing strip extends from the glass pane 19 to a position flush with the outer faces of the stiles.

A second pane of glass 30, the same size as the pane 19, is positioned with its lower edge resting on the upper edge of the resilient strip 26 which is below the rabbet 16 about the same amount as the depth of the groove 18. This resilient strip supports the weight of this latter pane while the sides of the pane come into contact with the putty 20 of the stiles. The upper edge of the pane 30 rests against the spacing strip 28, slightly below the upper rail and will be clear of any interference with the upper sash (not shown) when either sash moves past the other.

To hold this latter pane of glass in place a second pair of strips 21 are used, one on each stile as indicated at 31. These latter strips have one edge positioned against the pane 30, or an adhesive resilient strip 32 could be interposed, while their opposite edges are manually slid under the inner edges of the strips 23 and contact the stiles, to form a double-resilient fastening for the glass pane 30. It is particularly pointed out that the pane 30 is positioned on the outer side of the pane 19.

From the above arrangement it will be seen that a space 33 is provided between the two glass panes 19 and 30 and while it is not airtight, it does form a dead air space which will prevent frosting of the glass pane 19 in the winter and form increased insulation to prevent loss of heat. As the space is not airtight, air pressure changes between the two panes of glass is vented and as the air passing therein is from the outside atmosphere, condensation does not occur to obscure vision therethrough. The strips 23, 25 and 31 may be painted the same color as the sash to blend therewith, or they may be made from white metal to form a decoration thereto. While metal is mentioned, they may also be made from plastic or other materials having a spring effect. When so positioned they can be quickly and manually removed for withdrawal and the thorough cleansing of both glass panes on either side, or ease of replacement when broken.

While I have shown the strips 21 secured by spaced nails both to the stiles and the lower rail, and such may appear unsightly, it is contemplated to use other methods of fastening, such as the strip shown at 34 in Figure 5. In this strip, one edge is bent down in spaced saw teeth 35. With this strip the saw teeth can be hammered into the wood to retain the one edge without unsightly nails while the other edge has resiliency and can be lifted thereagainst when the second strips 31 are inserted to hold the second pane of glass in place. The strip 34 could also be used on the lower rail 14, the saw teeth being at the top and passing through the resilient strip 26. In this connection it may be noted that, as the resilient strip is some distance below the rabbet for support of the pane 30, this pane can be the same standard size as the pane 19.

In Figure 6 I have shown a method of securing the second pane of glass 30 to a metal window sash. In this construction, the frame of the sash 36 is formed solid (although it could be hollow) while a tongue 37 is formed integral therewith to provide a groove 38 therebetween. The second pane 30 is positioned against the channel 39, holding the first pane 19, while the strips 21 are slid into the grooves 38 with their inner edges contacting the pane 30 for a single resilientfastening, or retainer, for said second pane. To prevent the strips 21 from working out of this groove by vibration or otherwise, a narrow strip of tape 40 may be adhesively secured to the pane 30, directly under the glass contacting edge of the strip 21.

What I claim as my invention is:

1. In combination with a window sash having a pane of glass mounted therein; a removable secondary glazing therefor, comprising: a supporting strip of resilient material secured along an outer side of the bottom rail of said sash; a secondary pane of glass having the lower edge thereof resting on said supporting strip and with the side edges thereof positioned against the outer faces of the frame of said sash and in spaced relation from said first mentioned pane of glass; channel forming members positioned along the outer faces of the stiles of said sash, clear of the edges of said secondary pane of glass; and a pair of spring resilient strips each having one edge thereof slidably and frictionally received within one of the channels formed by said channel forming members and with the other edges thereof overlying and resiliently holding said secondary pane of glass in position against said sash.

2. In combination with a window sash having a pane of glass mounted therein; a removable secondary glazing therefor, comprising: a supporting strip of resilient material secured along an outer side of the bottom rail of said sash; a pair of spring resilient strips of curved cross section; each of said strips secured to one of the outer faces of the stiles of said sash such, that their inner sides can be resiliently sprung open to form individual channels with said stiles; a secondary pane of glass having the lower edge thereof resting on said supporting strip, between and clear of said spring resilient strips and in spaced relation from said first mentioned pane of glass, with the side edges thereof positioned against the outer faces of the stiles of said sash; and -a further pair of spring resilient strips, each having one edge thereof slidably and frictionally received Within the channels formed by said first mentioned spring resilient strips and with their opposite sides overlying and resiliently holding said secondary pane of glass in position against said sash.

3. In combination with a window sash having a pane of glass putty mounted therein; a removable secondary glazing therefor, comprising: a supporting strip of resilient material secured along an outer side of the bottom rail of said sash; a spacing strip secured along the underside of the top rail of said sash, from said pane of glass to a position flush with the outer faces of the stiles of said sash; a pair of spring resilient strips of curved cross section; said latter strips each having a longitudinal side thereof secured to one of the outer faces of the stiles of said sash and the other side thereof resiliently liftable therefrom; a secondary pane of glass positioned between and clear of said spring resilient strips and having the lower edge thereof resting on said supporting strip, the side edges thereof resting against the outer edges of the stile-supporting putty holding said first mentioned pane of glass, and with the upper edge thereof resting against said spacing strip; and a further pair of spring resilient strips of curved cross section each having one edge thereof frictionally slidable under the inner side of one of said first mentioned spring resilient strips and with the other edge thereof overlying and resiliently holding said secondary pane of glass in place.

4. A removable secondary glazing for a window sash as defined in claim 3 wherein the supporting strip is held in place by an overlapping spring resilient strip of curved cross section and both of said strips secured to said bottom rail by the same fastening means.

References Cited in the file of this patent UNITED STATES PATENTS 2,129,404 Bugatti Sept. 6, 1938 2,246,075 Phillips et a1. June 17, 1941 2,591,780 Cameron Apr. 8, 1952 2,617,160 Bodnar Nov. 11, 1952 

